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Thermo-Responsive Jamming of Nanoparticle Dense Suspensions towards Macroscopic Liquid-Solid Switchable Materials.

Mingqian Liu1,2, Xizi Wan1, Man Yang1

  • 1CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.

Angewandte Chemie (International Ed. in English)
|November 22, 2021
PubMed
Summary

Researchers developed smart liquid-solid switchable materials using reversible nanoparticle aggregation. These materials exhibit tunable properties and anti-impact capabilities, inspired by thermo-responsive jamming of silica-poly(N-isopropylacrylamide) nanoparticles.

Keywords:
Dense suspensionsInterfacial interactionsLiquid-solid transitionResponsive jammingSmart materials

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Nanoparticle aggregation is key for functional materials.
  • Existing methods often yield irreversible aggregation.
  • Thermodynamic limitations restrict controllable material properties.

Purpose of the Study:

  • To develop reversible disordered aggregation of nanoparticles.
  • To create smart liquid-solid switchable materials.
  • To explore temperature-responsive jamming for tunable properties.

Main Methods:

  • Synthesized silica-poly(N-isopropylacrylamide) nanoparticles (SPNPs).
  • Utilized thermo-responsive jamming for aggregation control.
  • Investigated temperature-dependent hydrophobic interactions.

Main Results:

  • Achieved reversible disordered aggregation of SPNPs.
  • Demonstrated liquid-solid switchable behavior with temperature changes.
  • Observed significant anti-impact properties in the solid-like state, withstanding high-speed impacts.

Conclusions:

  • Thermo-responsive jamming enables smart liquid-solid switchable materials.
  • Reversible aggregation offers tunable material properties.
  • Potential applications in impact protection materials.